Rubidium

== German == === Etymology === From Latin rubidus (“red”). === Pronunciation === === Noun === Rubidium n (strong, genitive Rubidiums, no plural) rubidium ==== Declension ==== === Further reading === “Rubidium” in Duden online “Rubidium”, in Digitales Wörterbuch der deutschen Sprache‎[1] (in German) == Luxembourgish == === Noun === Rubidium ? (uncountable) rubidium